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55 lines
1,020 B
NASM
55 lines
1,020 B
NASM
;;
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;; This file is part of the "Coroutine" project and released under the MIT License.
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;;
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;; Created by Samuel Williams on 10/5/2018.
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;; Copyright, 2018, by Samuel Williams.
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;;
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.386
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.model flat
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.code
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assume fs:nothing
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; Using fastcall is a big win (and it's the same has how x64 works).
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; In coroutine transfer, the arguments are passed in ecx and edx. We don't need
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; to touch these in order to pass them to the destination coroutine.
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@coroutine_transfer@8 proc
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; Save the thread information block:
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push fs:[0]
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push fs:[4]
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push fs:[8]
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; Save caller registers:
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push ebp
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push ebx
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push edi
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push esi
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; Save caller stack pointer:
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mov dword ptr [ecx], esp
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; Restore callee stack pointer:
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mov esp, dword ptr [edx]
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; Restore callee stack:
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pop esi
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pop edi
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pop ebx
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pop ebp
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; Restore the thread information block:
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pop fs:[8]
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pop fs:[4]
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pop fs:[0]
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; Save the first argument as the return value:
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mov eax, dword ptr ecx
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; Jump to the address on the stack:
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ret
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@coroutine_transfer@8 endp
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end
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